Amd feank e



Patented June 12,1883.

(No Model.)

E. R. KNOWLES'Kv I. E. IDELL. ARMATURE FOR DYNAMO ELECTRIC MACHINES. No. 279,399.

V TOR ATTORNEY UNITED STATES EDNVARD R. KNOWLES, OF BROOKLYN, NEW YORK, AND FRANK OF HOBOKEN, NEWV JERSEY.

PATENT, OFFICE.

IDELL,

ARMATUREY FOR DIYNAMO-ELEQTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 279,399, dated June 12, 1883.

I Application filed September 6, 18852. (No model.)

'0 all whom it may concern Be it known that we, EDWARD R. KNOWLES, a resident of Brooklyn, in the county of Kings and State of New York, and FRANK E. IDELL,

a resident of Hoboken, in the county of Hudson and State of New Jersey, have invented certain Improvements in Rotating Armatu res for Dynamo-Electric Machines, of which the following is a specification, reference being bad 1-0 to the accompanying drawings and the letters and figures of reference marked thereon.

Our improvement relates to the construction of the cores or carriers for the revolving coils in a dynamoelectric machine; and our inven- I 5 tion consists in so forming the revolving core that it insures perfect insulation of the coils of wire which are wound upon it, and in so arranging the metal forming part of the core as to prevent, in a great measure, the generation of Foucault currents and avoid all unnecessary heating of the same.

As our improvement relates solely to the construction of the core or carrier for the rotating coils, and as the use of rotating coils in dynamoelectric machines is well known, we

do not deem it necessary to describe any parti cular dynamo-electric machine.

Our improvement will be found useful in any dynamo-electric machine, irrespective of the 0 number of magnets employed and irrespective of the mode of connecting the coils of such machines in an electric circuit.

In the accompanying drawings, Figure 1 is a longitudinal section of the armature-core.

3 5 Fig. 2 is a cross-section of the same, and Fig. 3 is a side view of the central part thereof.

In some of the armature-cores at present in use the core is built of rods or bars of metal connecting the metallic heads and wound with fine iron wire to build them to the proper size. Our invention is in part to dispense with the bars used to form the core, and yet retain all the advantages of the same also, as the winding of the core with fine iron wire is tedious 4 5 and expensive, the invention is in part to wind the cores with material in a form which can be expeditiously and cheaply applied.

In all armature-cores formed of metal with intervention of any material for the purpose of 5 5- insulation.

In Fig. 1, B is the revolving shaft, on which the core is placed. The central portion, 1), Figs. 2 and 3, is a central casting of iron, formed with continuous ends H H and connected together by the longitudinal bars D, which are connected together at intervals by the ribs H. The surface of this cylinder may be made plain and perforated in a great variety of ways, all. yielding similar results; but this form is the one preferred by us. By this method of construction all the difficulties of making the bar armature cores are avoided and all their valuable qualities obtained at a very moderate cost.

The heads A A are formed of papier-mach or of any suitable insulating material. They are pressed in molds to the desired form and are bushed with the metallic cores G G. The metal bushings G G are perforated, as shown in Fig. 2, thus making the hollow core open at both ends, so that there can be a free circulation of air through it. 7

The central part, D, is fastened to the heads A A by screws or in. any suitable manner, and the whole is held on the shaft B by the set-nuts O C and keys J J. After the core is formed it is bound with rings E of soft strap-iron. These rings are separated from one another by spaces, giving access to the interior of the core to allow a free circulation of air, and also at regular intervals by the papier-mach disks F, formed as shown. These disks may also be made of anysuitable insulating material.

By this method of construction an armaturecore is obtained which has no projecting part of metal, and on which the insulated wire coils can at once be wound, there being no danger of any crosses occurring between the wire and the core, as all the parts over which the wire is passed are of non-conducting material.

Having thus described our invention, What and the ends thereof being covered by no1lwe elzti1n1's eonduoting liendS, substantially {1S described. 10

ln 1 dynamo-electric lllilPlllllO the core ofzt w V 'f'. 'K JLK') rotatnig e011, consisting 01 a hollow cylinder I FRANK E. IIYELL.

having a inortised or perforated wall carried upon suitable central pieces, the wall of" said cylinder being covered at intervals with int-en vening rings of metal and insulating nuiteifiul,

\Vitnesses:

WM. H. BROADNAX, J. EDGAR BULL. 

